I found a Facebook group for a new free open source firmware for the Gotek USB floppy emulators called 'FlashFloppy'. It's compatible with a number of image file formats, including compatability with .hfe images used by the HxC firmware.
https://www.facebook.com/groups/820618618098373/
Floppy Emulator For Usb Freeware PhraseExpress for USB PhraseExpress for USB is launched to be a helpful and smart program which eliminates repetitive typing and manages frequently used text snippets in customizable categories.Boilerplate templates can be stored together with bitmaps and RTF or HTML text. No thanks Try it free. GOTEK USB Floppy Emulator Simulator Review Tutorial PhilsComputerLab. I've been using the GOTEK USB Floppy Emulator Simulator since the beginning of 2013 and they.
One advantage is using some free Windows utilities (will work with VMWare Fusion) you can flash the Gotek via the front USB port, and don’t need to use any serial adapter or do any soldering. Instruction video on YouTube:
https://www.youtube.com/watch?v=yUOyZB9cro4
Using the usual floppy converter cable sold on eBay for the SY99, if you're using the Gotek SFRM72-TU100K, you then just place jumpers on the JC and M0 pins and you’re good to go.
Manny